js: observe input event

observe.js

//Observe input events
// Do your stuff after 1 seconds of last user input
$(document).on('input keyup', '.observe', function () {
    var $this = $(this);
    var delay = 500; // 0.5 seconds delay after last input

    clearTimeout($this.data('timer'));
    $this.data('timer', setTimeout(function () {
        $this.removeData('timer');
        // Do your stuff after 0.5 seconds of last user input
        if ($this.val()) {
            $this.trigger('change');
        }
    }, delay));
});